Buckle



FIG. 1 is a top view of a buckle bearing the design;

FIG. 2 is a bottom view of the buckle;

FIG. 3 is a front view of the buckle;

FIG. 4 is a rear view of the buckle;

FIG. 5 is a right side view of the buckle; and,

FIG. 6 is a perspective view of the buckle.

The broken lines in FIG. 2 are included for the purpose of illustrating a portion of the buckle that forms no part of the claimed design. 

The ornamental design for a buckle, as shown and described. 